JP7452457B2 - power transmission device - Google Patents

Description

The present invention relates to a power transmission device.

2. Description of the Related Art As a power transmission device mounted on a vehicle, a transfer is known that distributes and transmits power from an engine (first power source) to front wheels and rear wheels. The output side of the transfer is connected to a propeller shaft for front wheels and a propeller shaft for rear wheels. The transfer can be switched between a two-wheel drive state in which power is output to only one propeller shaft, and a four-wheel drive state in which power is output to both propeller shafts.

Patent Document 1 discloses that in a transfer including an auxiliary power source (second power source) in a transfer case, power output from the second power source is transmitted to front wheels and rear wheels via a differential device. is disclosed. In the configuration described in Patent Document 1, one of the three rotating elements included in the differential is fixed to the transfer case, so that the differential functions as a transmission, and the first power source is The rotation can be transmitted to the output member by changing the speed using a differential device.

International Publication No. 2010/141682

In the configuration described in Patent Document 1, when four-wheel drive is performed with the differential gear operating as a differential, the torque of the second power source acts on the first output shaft and the second output shaft, so that the There is a risk that the torque of the output shaft will be in the opposite direction.

The present invention has been made in view of the above circumstances, and provides a power transmission device that can suppress the torques of the respective output shafts from going in opposite directions when power is transmitted via a differential device. The purpose is to

The present invention includes a first input shaft that inputs power from a first power source, a second input shaft that inputs power from a second power source, and a first output shaft that outputs power to a first drive wheel. , a second output shaft that outputs power to a second drive wheel, a first rotation element to which the second input shaft is connected, and a second rotation element to which the second output shaft is connected, as the three rotation elements. and a third rotating element to which the first input shaft and the first output shaft are connected, the power transmission device comprising: It is characterized by comprising an engagement device that selectively connects the two.

According to this configuration, the engagement device can limit the differential operation of the differential device by connecting any two of the three rotating elements included in the differential device. As a result, when power is transmitted through the differential, if the differential operation of the differential is restricted by the engagement device, it is possible to prevent the torques of the respective output shafts from going in opposite directions. .

Further, the engagement device may switch between an engaged state in which the three rotating elements can rotate together and a released state in which the three rotating elements can be differentially moved.

According to this configuration, by switching the engagement device between the engaged state and the disengaged state, it is possible to switch between a state in which differential operation of the differential device is limited and a state in which it is not limited.

Further, the engagement device may selectively connect the second rotating element and the third rotating element.

According to this configuration, when the second rotating element and the third rotating element are connected by the engagement device, the three rotating elements can rotate together. As a result, the differential operation of the differential device can be restricted, and even if the torque of the second power source acts, it is possible to suppress the torques of the first output shaft and the second output shaft from going in opposite directions. can.

Further, the engagement device may be a friction engagement device.

According to this configuration, it is possible to configure the engagement device by a frictional engagement device.

Further, the engagement device may selectively connect the first rotating element and the second rotating element.

According to this configuration, when the first rotating element and the second rotating element are connected by the engagement device, the three rotating elements can rotate together. As a result, the differential operation of the differential device can be restricted, and even if the torque of the second power source acts, it is possible to suppress the torques of the first output shaft and the second output shaft from going in opposite directions. can.

Further, the differential device may be a planetary gear device.

According to this configuration, it is possible to configure the differential device with a planetary gear device.

The invention further includes a first transmission device provided in a power transmission path between the differential device and the second output shaft, the first output shaft being arranged on the same axis as the first input shaft. , the second output shaft may be arranged parallel to the first output shaft, and may be connected to the differential device via the first transmission device so as to be capable of transmitting power.

According to this configuration, power can be transmitted to the second output shaft and the second drive wheel via the differential device and the first transmission device.

Further, the first transmission device may include a chain belt.

According to this configuration, the first transmission device can be a mechanism including a chain belt.

Further, the first transmission device and the differential device are disposed in this order from the first power source side on the same axis as the first output shaft, and the second output shaft is arranged in the same direction as the first transmission device in the axial direction. The first power source may extend from the first power source toward the first power source.

According to this configuration, since the first transmission device is located closer to the first power source than the differential device, the second output shaft can be shortened.

Further, the first transmission device and the engagement device are disposed in this order from the first power source side on the same axis as the first output shaft, and the second output shaft is arranged in the same direction as the first transmission device in the axial direction. The first power source may extend from the first power source toward the first power source.

According to this configuration, the second output shaft can be shortened by locating the first transmission device closer to the first power source than the engagement device.

Further, the differential device and the second power source are arranged in this order from the first power source side on the same axis as the first output shaft, and the second output shaft is connected to the differential device in the axial direction. The first power source may extend from a position between the second power source and the first power source.

According to this configuration, the second output shaft can be shortened by extending from the axial position between the differential gear and the second power source toward the first power source.

The invention further includes a second transmission device provided in a power transmission path between the second power source and the differential device, and the second power source is connected to the first output shaft and the second output shaft. In contrast, it may be disposed on a separate shaft and connected to the differential device via the second transmission device so as to be capable of transmitting power.

According to this configuration, a degree of freedom in the arrangement of the second power source or the differential device can be obtained.

Further, the second transmission device may be a reduction gear.

According to this configuration, the rotation of the second power source can be decelerated and transmitted to the second input shaft.

In the present invention, the engagement device can limit the differential operation of the differential device by connecting any two of the three rotating elements included in the differential device. As a result, when power is transmitted through the differential, if the differential operation of the differential is restricted by the engagement device, it is possible to prevent the torques of the respective output shafts from going in opposite directions. .

FIG. 1 is a skeleton diagram schematically showing a vehicle equipped with a power transmission device according to an embodiment. FIG. 2 is a skeleton diagram schematically showing the configuration of the transfer in the embodiment. FIG. 3 is a collinear diagram showing the states of rotating elements in the planetary gear device in an integrated state. FIG. 4 is a skeleton diagram schematically showing the configuration of the transfer in the first modification. FIG. 5 is a skeleton diagram schematically showing the configuration of the transfer in the second modification. FIG. 6 is a skeleton diagram schematically showing the configuration of a transfer in a third modification. FIG. 7 is a skeleton diagram schematically showing the configuration of a transfer in a fourth modification. FIG. 8 is a skeleton diagram schematically showing the configuration of a transfer in a fifth modification. FIG. 9 is a skeleton diagram schematically showing the configuration of a transfer in the sixth modification.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, the power transmission device in embodiment of this invention is demonstrated concretely. Note that the present invention is not limited to the embodiments described below.

FIG. 1 is a skeleton diagram schematically showing a vehicle equipped with a power transmission device according to an embodiment. The vehicle 1 includes an engine 2 as a power source, left and right front wheels 3L, 3R, left and right rear wheels 4L, 4R, and a power transmission device 10 that transmits the power of the engine 2 to the front wheels 3 and rear wheels 4, respectively. , is equipped with. This vehicle 1 is a four-wheel drive vehicle based on front engine rear wheel drive. The rear wheels 4 are main drive wheels that serve as driving wheels both during two-wheel drive driving and during four-wheel drive driving. On the other hand, the front wheel 3 is a sub-drive wheel that becomes a driven wheel during two-wheel drive driving and becomes a driving wheel during four-wheel drive driving. In this embodiment, the rear wheel 4 is the first driving wheel, and the front wheel 3 is the second driving wheel.

The power transmission device 10 includes a transmission 11 connected to the engine 2, a transfer 12 which is a front and rear wheel power distribution device connected to the transmission 11, and a front propeller shaft 13 and a rear propeller shaft connected to the transfer 12, respectively. 14, a front wheel differential gear mechanism 15 connected to the front propeller shaft 13, a rear wheel differential gear mechanism 16 connected to the rear propeller shaft 14, and left and right front wheel axles connected to the front wheel differential gear mechanism 15. 17L, 17R, and left and right rear wheel axles 18L, 18R connected to the rear wheel differential gear mechanism 16. Note that when there is no particular distinction between the left and right wheels and axles, the symbols L and R are omitted and they are described as a front wheel 3, a rear wheel 4, a front wheel axle 17, and a rear wheel axle 18.

The power output from the engine 2 is transmitted to the transfer 12 via the transmission 11. The power transmitted to the transfer 12 is transmitted from the transfer 12 to the rear wheels 4 via the rear propeller shaft 14, the rear wheel differential gear mechanism 16, and the rear wheel side power transmission path of the rear wheel axle 18 in this order. Ru. Further, a part of the power transmitted to the rear wheels 4 side is distributed to the front wheels 3 side by the transfer 12, and the power transmission path on the front wheels side of the front propeller shaft 13, the front wheel differential gear mechanism 15, and the front wheel axle 17 is sequentially transmitted. The signal is transmitted to the front wheels 3 via the front wheel 3.

FIG. 2 is a skeleton diagram schematically showing the configuration of the transfer in the embodiment. The transfer 12 includes a transfer case 20 that is a non-rotating member. The transfer 12 also includes a first input shaft 21 , a second input shaft 22 , a rear wheel output shaft 23 , a front wheel output shaft 24 , a planetary gear device 25 , and a transmission device 26 in the transfer case 20 . , a motor 30, and an engagement device 40.

The first input shaft 21 is an input member that inputs power from the engine 2 to the transfer 12. Power from the engine 2 is transmitted to the first input shaft 21 via the transmission 11. For example, the first input shaft 21 is spline-fitted to the output member of the transmission 11.

The second input shaft 22 is an input member that inputs power from the motor 30 to the planetary gear device 25 . The power from the motor 30 is directly input to the second input shaft 22 . For example, the second input shaft 22 is spline-fitted to the output member (rotor shaft 33) of the motor 30, and rotates integrally with the rotor shaft 33.

The rear wheel side output shaft 23 is an output member that outputs power from the transfer 12 to the rear wheels 4. This rear wheel side output shaft 23 is a main drive shaft arranged on the same axis as the first input shaft 21 and connected to the rear propeller shaft 14. In the transfer 12, the rear wheel side output shaft 23 is the first output shaft.

The front wheel side output shaft 24 is a second output shaft that outputs power from the transfer 12 to the front wheels 3. The front-wheel output shaft 24 is a sub-drive shaft that is arranged on a different axis from the first input shaft 21 and the rear-wheel output shaft 23 and is connected to the front propeller shaft 13 . In the transfer 12, the front-wheel side output shaft 24 is a second output shaft arranged parallel to the first output shaft and connected to the planetary gear device 25 via a transmission device 26 so as to be capable of transmitting power.

The planetary gear device 25 is a differential device having three rotating elements, and is constituted by a single pinion type planetary gear device. This planetary gear device 25 functions as a power splitting mechanism that divides the power of the power source between the front wheels 3 and the rear wheels 4.

As shown in FIG. 2, the planetary gear device 25 has three rotating elements: a sun gear S, a carrier C that rotatably and revolvingly supports multiple pairs of mutually meshing pinion gears, and a carrier C that meshes with the sun gear S via the pinion gears. It is equipped with a ring gear R. In this embodiment, the sun gear S is the first rotating element, the carrier C is the second rotating element, and the ring gear R is the third rotating element.

A second input shaft 22 is connected to the sun gear S so as to rotate therewith. That is, the motor 30 is connected to the sun gear S.

A first rotating member 51 is connected to the carrier C so as to rotate together with the carrier C. The first rotating member 51 is a member that rotates integrally with the carrier C, and has gear teeth 51a as an engagement element. A drive gear 27 of the transmission device 26 is connected to the first rotating member 51 so as to rotate therewith. The transmission device 26 forms a power transmission path between the planetary gear device 25 and the front wheel side output shaft 24. That is, the front wheel side output shaft 24 is connected to the carrier C.

A second rotating member 52 is connected to the ring gear R so as to rotate together with the second rotating member 52. The second rotating member 52 is a member that rotates integrally with the ring gear R, and has gear teeth 52a as engagement elements. The first input shaft 21 and the rear wheel output shaft 23 are connected to the second rotating member 52 so as to rotate together. In other words, the first input shaft 21 and the rear wheel side output shaft 23 are connected to the ring gear R.

The transmission device 26 is a mechanism that forms a power transmission path for the front wheels, and is provided in the power transmission path between the planetary gear device 25 and the front wheel output shaft 24 . This transmission device 26 includes a drive gear 27, a driven gear 28, and a chain belt 29.

The drive gear 27 is a rotating member that functions as an output section to the front wheel side, and is an output gear that transmits power to the front wheel side output shaft 24. The drive gear 27 is disposed on the same axis as the first input shaft 21 and the rear output shaft 23 so as to be rotatable relative to the first input shaft 21 and the rear output shaft 23, and is integrated with the carrier C. connected to rotate. In the transfer 12, the drive gear 27 and each rotating element of the planetary gear device 25 are arranged on the same rotation center as the rear wheel side output shaft 23.

The driven gear 28 is a gear provided integrally with the front wheel side output shaft 24. The chain belt 29 is a front wheel drive chain that connects the drive gear 27 and the driven gear 28. When the drive gear 27 rotates, the driven gear 28 rotates, and the driven gear 28 and the front wheel side output shaft 24 rotate together. In this embodiment, the transmission device 26 is the first transmission device.

The motor 30 is a rotating electric machine (motor generator) that can function as an electric motor and a generator. Further, the motor 30 is electrically connected to a battery via an inverter. This motor 30 includes a rotor 31, a stator 32, and a rotor shaft 33. The rotor 31 rotates integrally with the rotor shaft 33. Stator 32 has a stator core and a stator coil wound around the stator core. The second input shaft 22 is connected to the rotor shaft 33 so as to rotate integrally therewith.

The engagement device 40 is a clutch that switches the state of the planetary gear device 25 between an engaged state and a released state. This engagement device 40 connects the carrier C and the ring gear R so that they rotate together. The engagement device 40 switches between an integrated state in which the carrier C and the ring gear R can rotate together, and a differential state in which the carrier C and the ring gear R can rotate relative to each other. That is, the engagement device 40 switches between an engaged state in which the differential operation of the planetary gear device 25 is restricted and a released state in which the differential operation of the planetary gear device 25 is not restricted.

This engagement device 40 is constituted by a dog clutch and has a switching sleeve 41. The switching sleeve 41 has gear teeth 41a as engagement elements. The gear teeth 41a mesh with gear teeth 51a of the first rotating member 51 that rotates integrally with the carrier C and gear teeth 52a of the second rotating member 52 that rotates integrally with the ring gear R. Further, the switching sleeve 41 is moved in the axial direction by the actuator of the engagement device 40. The switching sleeve 41 switches between an integrated state in which the carrier C and the ring gear R are rotatably coupled together, and a differential state in which the three rotating elements perform differential operation. That is, the engagement device 40 is brought into an engaged state by the gear teeth 41a of the switching sleeve 41 meshing with both the gear teeth 51a and the gear teeth 52a, and the gear teeth 41a of the switching sleeve 41 meshing with the gear teeth 51a and 52a. By engaging only one of them, it becomes a released state.

Further, inside the transfer case 20, a motor 30, a transmission device 26, and a planetary gear device 25 are arranged on the same axis as the rear wheel side output shaft 23 in this order from the engine side in the axial direction. Further, the front wheel output shaft 24 extends from the transmission device 26 toward the engine in the axial direction.

When the transfer 12 enters the four-wheel drive state, there is a differential state in which the rotational differential between the rear propeller shaft 14 and the front propeller shaft 13 is not limited, and a non-differential state in which the rotational differential between them is limited. Switch between differential state. That is, in the power split state of the transfer 12, there are cases where the rear wheel side output shaft 23 and the drive gear 27 are in a differential state, and cases where the rear wheel side output shaft 23 and the drive gear 27 are in a non-differential state. It is possible to switch between cases.

The vehicle 1 also includes an electronic control device 100 that controls the vehicle 1, as shown in FIG. The electronic control device 100 outputs a command signal to an actuator that operates the engagement device 40 to control the operation of the engagement device 40 . For example, the electronic control device 100 includes a microcomputer equipped with a CPU, RAM, ROM, input/output interface, and the like. The CPU executes various controls of the vehicle 1 by performing signal processing according to programs stored in advance in the ROM while utilizing the temporary storage function of the RAM.

Signals from various sensors mounted on the vehicle 1 are input to the electronic control device 100 . For example, sensor signals from an engine rotation speed sensor, a motor rotation angle sensor, a vehicle speed sensor, an accelerator opening sensor, and a 4WD selection switch for selecting a four-wheel drive state by driver operation are input to the electronic control device 100. . The electronic control device 100 performs drive control of the vehicle 1 based on input sensor signals. The electronic control device 100 outputs a command signal for controlling the engine 2, a command signal for controlling the transmission 11, a command signal for controlling the transfer 12, and the like. The command signal for controlling the transfer 12 includes a command signal for controlling the motor 30 and a command signal for controlling the engagement device 40.

Therefore, when controlling the driving state of the transfer 12, the electronic control device 100 controls the operation of the motor 30 and also controls the state of the planetary gear device 25 by controlling the state of the engagement device 40. The planetary gear device 25 can be switched between an integrated state and a differential state by the electronic control device 100 executing switching control of the engagement device 40 . The integrated state is a state in which two of the three rotating elements included in the planetary gear device 25 are connected to each other. The differential state is a state in which the three rotating elements included in the planetary gear device 25 can perform differential operation. In the transfer 12, the three rotating elements are connected to the motor 30, the engine 2, the rear output shaft 23, and the front output shaft 24, respectively, regardless of the state of the planetary gear device 25.

FIG. 3 is a collinear diagram showing the states of rotating elements in the planetary gear device in an integrated state. In addition, in FIG. 3, the motor 30 is "MG", the engine 2 is "ENG", the sun gear S is "S", the carrier C is "C", the ring gear R is "R", and the engagement device 40 is "CL". It is stated that.

In the transfer 12, as shown in FIG. 3, the engagement device 40 enters the engaged state, thereby bringing the planetary gear device 25 into the integrated state. In this integrated state, a fixed distribution 4WD mode is possible as a four-wheel drive state in which power is transmitted to the front wheels 3 and rear wheels 4. That is, when the transfer 12 is in the fixed distribution 4WD mode, the switching sleeve 41 engages with the first rotating member 51 and the second rotating member 52.

In this fixed distribution 4WD mode, the power transmitted from the engine 2 to the first input shaft 21 is transmitted to the rear wheel side output shaft 23, and is also transmitted to the front wheel side output shaft 23 via the integrated planetary gear device 25. is transmitted to. In other words, in the fixed distribution 4WD mode, when the power of the engine 2 is distributed to the front wheel side output shaft 24, the engagement device 40 is in the engaged state, so the differential operation of the planetary gear device 25 is limited, and the three rotational The elements have the same rotation speed. Therefore, when the torque Tm of the motor 30 is applied to the front wheel output shaft 24, both the torque T2 acting on the front wheel output shaft 24 and the torque T1 acting on the rear wheel output shaft 23 are made into positive torques. Is possible. Thereby, when transmitting the torque Tm of the motor 30 to the front wheel side output shaft 24 via the planetary gear device 25, it is possible to suppress the torques T1 and T2 of the respective output shafts from being in opposite directions. Note that when the torques of the respective output shafts are in opposite directions, when the motor 30 outputs torque so that the torque in the forward direction acts on the front wheel side output shaft 24, the torque reaction force is applied to the rear wheel side output shaft 23. This represents a case where the torque of the front wheel output shaft 24 is in the positive direction while the torque of the rear wheel output shaft 23 is in the negative direction. In other words, the direction of torque is opposite between the front wheel side output shaft 24 and the rear wheel side output shaft 23. In this embodiment, the motor 30 outputs torque in the forward direction in order to apply torque in the forward direction to the front wheel output shaft 24 .

Further, in the transfer 12, the engagement device 40 is released, so that the planetary gear device 25 is placed in a differential state. In this differential state, a so-called torque split 4WD mode is possible as a four-wheel drive state in which power is transmitted to the front wheels 3 and rear wheels 4. The purpose of the torque split mode is to generate driving force to the front wheels 3 using the power of the motor 30 and change the power distribution transmitted to the rear wheel output shaft 23 and the front wheel output shaft 24. That is, in the torque split 4WD mode, front and rear distribution control is possible using the motor torque output from the motor 30. When the transfer 12 is in the torque split 4WD mode, the switching sleeve 41 engages only one of the first rotating member 51 and the second rotating member 52.

In this torque split 4WD mode, the power transmitted from the engine 2 to the first input shaft 21 is transmitted to the rear wheel side output shaft 23, and the power transmitted from the motor 30 to the second input shaft 22 is in a differential state. It is transmitted to the front wheel side output shaft 24 via the planetary gear device 25 . That is, in the torque split 4WD mode, when the power from the power source is distributed between the front wheels 3 and the rear wheels 4, the planetary gear set 25 can be differentially operated because the engagement device 40 is in the released state. Therefore, in the torque split 4WD mode, the torque output from the motor 30 makes it possible to control the distribution of power transmitted to the front wheels and the rear wheels. In this case, since the differential operation of the planetary gear device 25 is not limited, when the motor 30 applies torque in the positive direction to the front wheel output shaft 24, the torque reaction force is applied to the rear wheel output shaft 23. Torque in the negative direction acts. In other words, positive direction torque due to the torque from the engine 2 and negative direction torque due to the torque reaction force of the motor torque act on the rear wheel side output shaft 23.

As described above, according to the embodiment, the differential operation of the planetary gear device 25 can be selectively restricted by switching the engagement device 40 between the engaged state and the released state. Therefore, when the differential operation of the planetary gear device 25 is limited, even if the torque of the motor 30 acts on the front wheel side output shaft 24 in the positive direction, the direction of the torque on each output shaft will be in the opposite direction. can be prevented from becoming.

Note that since the motor 30 is constituted by a rotating electric machine (motor/generator), it can generate electricity using the power from the engine 2 or regenerate electricity using the power input from the drive wheels. Electric power generated by the motor 30 is stored in a battery. Furthermore, the first power source and the second power source may be either an engine or a rotating electric machine. For example, the first power source may be a rotating electric machine, and the second power source may be an engine.

Further, as a modification of the above-described embodiment, a friction type engagement device may be provided instead of the meshing type engagement device 40. For example, as shown in FIG. 4, the transfer 12 of the first modification includes a friction engagement device 60 that selectively connects the carrier C and the ring gear R.

The frictional engagement device 60 selectively connects a first rotating member 51 that rotates integrally with the carrier C and a second rotating member 52 that rotates integrally with the ring gear R. The frictional engagement device 60 includes a first frictional engagement element that rotates integrally with the first rotating member 51 and a second frictional engagement element that rotates integrally with the second rotating member 52. The frictional engagement device 60 is operated by a hydraulic actuator. Further, in this first modification, the motor 30, the transmission device 26, the friction engagement device 60, and the planetary gear device 25 are arranged on the same axis as the rear wheel side output shaft 23 in this order from the engine side in the axial direction. There is. By locating the frictional engagement device 60 at the rear of the transmission device 26, the front wheel side output shaft 24 can be shortened.

Furthermore, when the three rotating elements are integrated to limit the differential operation of the planetary gear device 25, the present invention is not limited to the case where the carrier C and the ring gear R are connected so as to be integrally rotatable. That is, the two rotating elements that are connected to be integrally rotatable are not particularly limited, and any two of the three rotating elements in the planetary gear device 25 may be selectively connected. For example, as shown in FIG. 5, the transfer 12 of the second modification includes a friction engagement device 61 that selectively connects the sun gear S and the ring gear R.

The frictional engagement device 61 selectively connects the third rotating member 53 that rotates integrally with the sun gear S and the second rotating member 52 that rotates integrally with the ring gear R. The frictional engagement device 61 includes a first frictional engagement element that rotates integrally with the third rotating member 53 and a second frictional engagement element that rotates integrally with the second rotating member 52. The frictional engagement device 61 is operated by a hydraulic actuator. Furthermore, in this second modification, the motor 30, the transmission device 26, the planetary gear device 25, and the friction engagement device 61 are arranged on the same axis as the rear wheel side output shaft 23 in this order from the engine side in the axial direction. There is. By locating the frictional engagement device 61 at the rear of the transmission device 26, the front wheel side output shaft 24 can be shortened.

Further, as a further modification of the second modification, the arrangement of the motor 30, the transmission device 26, the planetary gear device 25, and the frictional engagement device 61 in the axial direction is different from the arrangement illustrated in FIG. Good too. For example, as shown in FIG. 6, in the transfer 12 of the third modification, a frictional engagement device 61, a planetary gear device 25, a transmission device 26, and a motor 30 are arranged in this order from the engine side in the axial direction. This provides flexibility in the arrangement of the motor 30 or the planetary gear device 25.

In addition, as another modification, the motor 30 is not limited to a configuration in which the first input shaft 21 and the rear wheel output shaft 23 are arranged on the same axis; may be arranged on a different axis. An example of this modification is illustrated in FIGS. 7 and 8.

For example, as shown in FIG. 7, the transfer 12 of the fourth modification includes a motor 30 arranged on a different axis from the first input shaft 21 and the second input shaft 22, and a motor 30 and the second input shaft 22 arranged on a different axis. and a second transmission device 70 provided in a power transmission path between the two. This fourth modification is a further modification of the second modification. In the transfer 12, the second transmission device 70, the transmission device 26, the friction engagement device 60, and the planetary gear device 25 are arranged in this order from the engine side in the axial direction.

The second transmission device 70 has a reduction gear 71, a counter gear 72, and an input gear 73. A reduction gear 71 is provided on the rotor shaft 33 of the motor 30. The reduction gear 71 meshes with a counter gear 72. Counter gear 72 meshes with input gear 73. The input gear 73 is attached to the second input shaft 22 and rotates together with the second input shaft 22 . A reduction gear train is formed by the reduction gear 71, the counter gear 72, and the input gear 73. Therefore, in the fourth modification, when the power output from the motor 30 is transmitted to the second input shaft 22 via the second transmission device 70, the rotation of the motor 30 is speed-changed (decelerated) and transmitted to the sun gear S. be done. Further, since the motor 30 is arranged on a different axis from the first input shaft 21 and the rear wheel side output shaft 23, it is possible to arrange the motor 30 at a position overlapping with the transmission device 26 in the axial direction. 12 can be made smaller in the axial direction. In this way, a degree of freedom in the arrangement of the motor 30 or the planetary gear device 25 can be obtained.

For example, as shown in FIG. 8, the transfer 12 of the fifth modification includes a motor 30 arranged on a different axis from the first input shaft 21 and the second input shaft 22, and a motor 30 and the second input shaft 22 arranged on a different axis. and a second transmission device 80 provided in a power transmission path between the two. This fifth modification is a further modification of the third modification. In the transfer 12, the frictional engagement device 61, the planetary gear device 25, the transmission device 26, the second transmission device 80, and the motor 30 are arranged in this order from the engine side in the axial direction.

The second transmission device 80 has a reduction gear 81 and an input gear 82. A reduction gear 81 is provided on the rotor shaft 33 of the motor 30. Reduction gear 81 meshes with input gear 82 . The input gear 82 is attached to the second input shaft 22 and rotates together with the second input shaft 22. Since the reduction gear 81 has a smaller diameter than the input gear 82, the reduction gear 81 and the input gear 82 form a reduction gear train. In other words, the second transmission device 80 is a reduction gear. Therefore, in the fifth modification, when the power output from the motor 30 is transmitted to the second input shaft 22 via the second transmission device 80, the rotation of the motor 30 is speed-changed (decelerated) and transmitted to the sun gear S. be done.

As another modification, as shown in FIG. 9, in the transfer 12 of the sixth modification, in the planetary gear device 25, the sun gear S is connected to the motor 30, and the carrier C is connected to the first input shaft 21 and A rear wheel side output shaft 23 is connected, and a front wheel side output shaft 24 is connected to the ring gear R. In this sixth modification, the sun gear S is the first rotating element, the ring gear R is the second rotating element, and the carrier C is the third rotating element.

In the torque split 4WD mode of this sixth modification, the motor 30 outputs negative torque in order to apply positive torque to the front wheel side output shaft 24. In other words, when the motor 30 outputs negative torque and applies positive torque to the front wheel output shaft 24 (ring gear R), the torque reaction force is applied to the rear wheel output shaft 23 (carrier C). Torque in the negative direction will act. As a result, positive direction torque due to the torque from the engine 2 and negative direction torque due to the torque reaction force of the motor torque act on the rear wheel side output shaft 23.

1 Vehicle 2 Engine (first power source)
3, 3R, 3L Front wheel 4, 4R, 4L Rear wheel 10 Power transmission device 11 Transmission 12 Transfer 13 Front propeller shaft 14 Rear propeller shaft 21 First input shaft 22 Second input shaft 23 Rear wheel side output shaft (first output shaft)
24 Front wheel side output shaft (second output shaft)
25 Planetary gear device 26 Transmission device 27 Drive gear 28 Driven gear 29 Chain belt 30 Motor 40 Engagement device 41 Switching sleeve 51 First rotating member 52 Second rotating member C Carrier S Sun gear R Ring gear

Claims (4)

a first input shaft that inputs power from a first power source;
a second input shaft that inputs power from a second power source;
a first output shaft that outputs power to the first drive wheel;
a second output shaft that outputs power to a second drive wheel;
The three rotating elements include a first rotating element to which the second input shaft is connected, a second rotating element to which the second output shaft is connected, and a first rotating element to which the first input shaft and the first output shaft are connected. a differential device having a third rotating element;
A power transmission device comprising:
an engagement device that selectively connects any two of the three rotating elements ;
a first transmission device provided in a power transmission path between the differential device and the second output shaft;
Equipped with
The first output shaft is arranged on the same axis as the first input shaft,
The second output shaft is arranged parallel to the first output shaft, and is connected to the differential device via the first transmission device so as to be capable of transmitting power,
The first transmission device and the differential device are arranged in this order from the first power source side on the same axis as the first output shaft,
The second output shaft extends in the axial direction from the first transmission device toward the first power source.
A power transmission device characterized by: a first input shaft that inputs power from a first power source;
a second input shaft that inputs power from a second power source;
a first output shaft that outputs power to the first drive wheel;
a second output shaft that outputs power to a second drive wheel;
The three rotating elements include a first rotating element to which the second input shaft is connected, a second rotating element to which the second output shaft is connected, and a first rotating element to which the first input shaft and the first output shaft are connected. a differential device having a third rotating element;
A power transmission device comprising:
an engagement device that selectively connects any two of the three rotating elements ;
a first transmission device provided in a power transmission path between the differential device and the second output shaft;
Equipped with
The first output shaft is arranged on the same axis as the first input shaft,
The second output shaft is arranged parallel to the first output shaft, and is connected to the differential device via the first transmission device so as to be capable of transmitting power,
The first transmission device includes a chain belt,
The first transmission device and the differential device are arranged in this order from the first power source side on the same axis as the first output shaft,
The second output shaft extends in the axial direction from the first transmission device toward the first power source.
A power transmission device characterized by: a first input shaft that inputs power from a first power source;
a second input shaft that inputs power from a second power source;
a first output shaft that outputs power to the first drive wheel;
a second output shaft that outputs power to a second drive wheel;
The three rotating elements include a first rotating element to which the second input shaft is connected, a second rotating element to which the second output shaft is connected, and a first rotating element to which the first input shaft and the first output shaft are connected. a differential device having a third rotating element;
A power transmission device comprising:
an engagement device that selectively connects any two of the three rotating elements ;
a first transmission device provided in a power transmission path between the differential device and the second output shaft;
Equipped with
The first output shaft is arranged on the same axis as the first input shaft,
The second output shaft is arranged parallel to the first output shaft, and is connected to the differential device via the first transmission device so as to be capable of transmitting power,
The first transmission device and the engagement device are arranged in this order from the first power source side on the same axis as the first output shaft,
The second output shaft extends in the axial direction from the first transmission device toward the first power source.
A power transmission device characterized by: a first input shaft that inputs power from a first power source;
a second input shaft that inputs power from a second power source;
a first output shaft that outputs power to the first drive wheel;
a second output shaft that outputs power to a second drive wheel;
The three rotating elements include a first rotating element to which the second input shaft is connected, a second rotating element to which the second output shaft is connected, and a first rotating element to which the first input shaft and the first output shaft are connected. a differential device having a third rotating element;
A power transmission device comprising:
an engagement device that selectively connects any two of the three rotating elements ;
a first transmission device provided in a power transmission path between the differential device and the second output shaft;
Equipped with
The first output shaft is arranged on the same axis as the first input shaft,
The second output shaft is arranged parallel to the first output shaft, and is connected to the differential device via the first transmission device so as to be capable of transmitting power,
The first transmission device includes a chain belt,
The first transmission device and the engagement device are arranged in this order from the first power source side on the same axis as the first output shaft,
The second output shaft extends in the axial direction from the first transmission device toward the first power source.
A power transmission device characterized by:

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